One way to debug apps is by logging information in the code. This enables seeing which code was run when a problem occurred and what the value of variables were. You can directly call
GLib.Log ()or use the convenience functions listed below.
Debug logs usually give detailed information on the flow through the system and are not printed to Terminal or logs by default.
string name = "Bob";
int age = 30;
debug ("Person: %s %i", name, age);
Use info log level to log informational messages as well as interesting runtime events. These logs are also immediately visible on a status console, and should be kept to a minimum.
info ("An event occured");
Use the message log level to output a message.
message ("An event occured");
The warning log level outputs messages that warn of, for example, use of deprecated APIs, 'almost' errors, or runtime situations that are undesirable or unexpected, but not necessarily "wrong". These logs are immediately visible on a status console.
warning ("Something potentially problematic happened!");
Critical log level is used when there is a severe application failure that should be investigated immediately.
critical ("A major issue occured! Uh oh!");
Error log level includes logs for runtime errors or unexpected conditions. These errors are immediately visible on a status console and cause your app to exit.
error ("Some catastrophic happened and the app had to exit!");